In egg processing plants, food factories, hatcheries, and central kitchens, eggshells are produced in large quantities every day. However, for most businesses, eggshells are not a resource but a persistent production problem. Eggshells are bulky, lightweight, and hard, and simply discarding them not only occupies storage space but also incurs additional costs for transportation and environmental treatment. Some companies have tried to crush the eggshells themselves, but found that ordinary crushing equipment is inefficient, prone to jamming, and suffers from severe wear and tear, making stable operation impossible. Even if the eggshells are successfully crushed, new problems arise: uneven particle size, excessive temperature rise during grinding affecting the quality of the eggshell powder,
dust flying around, poor working environment, frequent cleaning and maintenance, high equipment failure rate, and long downtime, affecting the overall production capacity. It is against this backdrop of practical production challenges that professional eggshell grinding machines have emerged.
These are not simply crushing devices, but specialized solutions designed for the high hardness, irregular shape, and continuous feeding requirements of eggshells, providing a reliable guarantee for businesses to achieve eggshell reduction, resource utilization, and value creation.

Table of contents

What is the best way to grind up eggshells?
What Is an Eggshell Grinding Machine?
Why Choose Our Eggshell Grinding Machine?
The working process of an eggshell grinding machine.
Working characteristics of the eggshell grinding machine
Frequently Asked Questions
Summary and Conclusion
About Pcreate

What is the best way to grind up eggshells?

Eggshell is a typical high-calcium, brittle, and thin-walled natural material, primarily composed of calcium carbonate (CaCO₃), along with a small amount of protein membrane and trace organic matter. Due to its unique structure, improper grinding methods can easily lead to uneven pulverization, low efficiency, equipment clogging, or excessive dust. Therefore, choosing the appropriate grinding method is crucial for achieving efficient and stable eggshell powder processing.

I. Key Pre-treatment Steps Before Eggshell Grinding

Proper pre-treatment of eggshells before grinding can significantly improve crushing efficiency and product quality.

1. Cleaning and Impurity Removal

Eggshells usually come from food processing plants, egg product factories, or catering waste recycling systems, and may have residual egg liquid, grease, or impurities on their surface. Cleaning is necessary before grinding to avoid odors and contamination.

2. Drying Treatment

Wet eggshells are not suitable for direct grinding. High moisture content can lead to:

– Reduced crushing efficiency

– Material sticking to blades or grinding chamber

– The finished product being prone to clumping and difficult to store

It is generally recommended to dry the eggshells to a moisture content of ≤5%, using natural air drying, hot air drying, or low-temperature drying methods.

3. Pre-crushing (Optional)

For whole or large eggshells, pre-crushing them into small particles of about 5–10 mm before the fine grinding stage can help improve overall production capacity.

II. The Best Method for Eggshell Grinding: Mechanical Crushing and Grinding Method

In current industrial applications, the mechanical crushing and grinding method is the most mature, efficient, and cost-effective method for grinding eggshells, especially suitable for continuous production.

1. Why is mechanical grinding best suited for eggshells?

Eggshells have the following characteristics:

– Moderate hardness and high brittleness

– Lack of high toughness or high oil content

– Do not require ultra-high energy consumption to be crushed

This makes eggshells very suitable for being crushed into fine powder through high-speed impact + shearing + friction.

What Is an Eggshell Grinding Machine?

An eggshell grinding machine is a specialized mechanical device used to crush and grind dried eggshells, processing whole or broken eggshells into eggshell powder of varying fineness. This equipment uses high-speed rotating components to impact, shear, and frictionally break down the eggshells, and a screening or classification system controls the final particle size.

Eggshell grinding machines are widely used in areas such as animal feed calcium supplementation, agricultural soil improvement, food additives, health product raw materials, and environmental resource recycling, and are one of the core pieces of equipment for deep processing and high-value utilization of eggshells.

Why Choose Our Eggshell Grinding Machine?

Efficient Grinding, Time-Saving

Our eggshell grinding machine utilizes advanced crushing technology to quickly grind eggshells into fine powder, improving production efficiency and suitable for large-scale processing.

Robust and Durable, Stable Operation

The entire machine is made of high-quality stainless steel, resistant to corrosion and wear, ensuring long-term stable operation and reducing maintenance costs.

Uniform Powder, Controllable Quality

The ground eggshell powder has a uniform particle size, and the fineness can be adjusted according to customer needs, meeting the standards of the food, feed, and chemical industries.

Hygienic and Safe, Easy to Clean

The fully enclosed design prevents dust leakage, complies with food-grade hygiene standards, and is easy to clean, ensuring a safe production process.

Energy-Saving and Environmentally Friendly, Low Noise

The equipment has low energy consumption, runs smoothly, and has good noise control, making it suitable for continuous operation in factories and reducing environmental impact.

Multifunctional Application

It is not only suitable for grinding eggshells but can also process other shellfish or hard food raw materials, increasing the return on investment.

The working process of an eggshell grinding machine.

Eggshell grinding is a specialized milling process that converts waste or recycled eggshells into fine, uniform eggshell calcium powder. The final powder is widely used in dietary supplements, animal feed, pet nutrition, fertilizers, and pharmaceutical applications To ensure high purity, controlled particle size, stable quality, and food-grade safety, eggshell powder production typically follows a multi-stage, low-temperature grinding process When the device starts, the main shaft drives the toothed disc to rotate at high speed, and the eggshells are subjected to multiple forces in the crushing chamber The eggshells collide instantaneously with the hammers or teeth, and are quickly shattered. The eggshells are then sheared into smaller particles between the rotating components and the fixed liner. The fine particles are further ground and refined in the chamber. Because eggshells are brittle materials with a high calcium content, this combination of impact and shearing can quickly complete the crushing process, resulting in high efficiency and low energy consumption.

Working characteristics of the eggshell grinding machine

High Grinding Efficiency:

The Egshell Grinding Machine impacts and orushes the egsshellraw materialusing the high-speedrelative motion of the sctive futed disc andthe fixed fluted disc. The capacity is up to 3,000 kg/h,makingit ideal for large-scale eg9 processing facilties handling high volumes of eggshellwaste

Adjustable Fineness:

The grindling machine offers adjustable settings to control the fineness of the eggshell powder. Whether producing coarse granule for fertilizer or ultra-fine powder for food and pharmaceutical applications,the machine delivers precise results.

Various Models Choice:

We supplyegsshell grading machines with capacities ranging from 20kg/h to 3,00oka/h, Youcan find yourideal machine whetheryou are asmall operator or a large egg procesaing plant.

Durable and Hygienic Design:

The e9gshell grinding machines are made of 304 food- grade stainless steel to meet food safety standarde. Corrosion-Resistent

Easy Operation and Safety Control:

User Friendly Interface. Equipped with a simple control panel, the machine is easy to operate, even for personnel without specialized training. Operators can easily adjust the grinding speed and fineness based on the type of application required.

Easy Cleaning and Maintenance:

The esgshellgrinding machines ere designed for eaey disasembly allowing for fast and thorousghcleaning of allparts This is crusialfor maintaining hygiene standarde, especilly when processing eggshells for food’grede applications. Durable and requires minimal maintenence.

Versatile Applications. Mult:

Use Functionality. The ginding machines are cepable of grinding a variety of materials in sdition to esshel,such as bones,shell,andother hard materials, This versatility makes it a valuable tool in various industries, including agriculture, food processing, and pharmaceuticals

Frequently Asked Questions

1. How finely can the eggshell grinding machine grind eggshells?

Answer: Our eggshell grinding machine can grind eggshells to a fineness of 10-120 mesh, with uniform particle size, adjustable according to customer needs, and suitable for feed, food, chemical, and other industries.

2. What is the processing capacity of the equipment?

Answer: The capacity varies depending on the model, ranging from 50 kg/h to 1000 kg/h, meeting the needs of small-scale experiments to large-scale production.

3. Does the machine overheat during eggshell grinding?

Answer: The machine is designed with a good heat dissipation system, maintaining a temperature below 50°C during grinding, effectively preventing nutrient loss or spoilage of the eggshell powder.

4. Is the material used in the equipment safe?

Answer: The entire machine is made of 304/316 stainless steel, which is corrosion-resistant, easy to clean, and meets food-grade safety standards.

5. Does the eggshell grinding machine produce dust?

Answer: The equipment adopts a fully enclosed structure, combined with a dust collection device, which effectively controls dust and ensures a clean production environment.

6. Is the equipment maintenance complicated?

Answer: The machine has a simple structure and is easy to disassemble and clean. Daily maintenance only requires checking the wear of the grinding discs/blades and the lubrication system.

7. Can it operate continuously and stably?

Answer: Yes, the machine is designed for 24-hour continuous operation, with stable performance, suitable for large-scale production.

8. Can the eggshell grinding machine grind other raw materials?

Answer: In addition to eggshells, it can also grind hard raw materials such as shells, bone meal, and corn cobs, offering a wide range of applications and a high return on investment.

Summary and Conclusion

With the expanding applications of eggshell powder in feed additives, food calcium supplements, agricultural soil conditioners, and industrial fillers, efficient, stable, and hygienic eggshell grinding equipment has become crucial in the production process.

Through professional structural design, the eggshell grinding machine successfully overcomes the processing difficulties associated with the high hardness, brittleness, and irregular shape of eggshells. It can continuously and stably grind eggshells into high-quality eggshell powder with uniform fineness. While ensuring production capacity, it effectively controls dust, temperature rise, and energy consumption, meeting the industrial demands for long-term continuous operation.

About Pcreate

Pinchuang Machinery provides complete powder processing solutions, covering crushing, conveying, mixing, sieving, and granulation. Our products serve industries such as food additives, bakery ingredients, pharmaceutical intermediates, health supplements, and chemical raw materials.

With advanced technology, precise engineering, and comprehensive pre-sales support, we have earned high praise from domestic and international clients. Pinchuang focuses on long-term cooperation, delivering high-quality products and reliable service. We ensure excellence in design, R&D, production, and installation, attending to every detail to maximize machine performance.

Contact Pinchuang today to assess your facility requirements and get a custom equipment configuration plan